https://en.wikipedia.org/wiki/Paintings_by_Adolf_Hitler
Even the better ones still look odd, like kitschy comics. For lack of a better description, his paintings completely lack any kind of poetic depth.
edit: the article actually contains a better description by John Gunther:
"They are prosaic, utterly devoid of rhythm, color, feeling, or spiritual imagination. They are architect's sketches painful and precise draftsmanship; nothing more. No wonder the Vienna professors told him to go to an architectural school and give up pure art as hopeless"